Tool for reaming and fitting valve seats



G. E. Moi-:N

Sept. 30, 1930.

` 'I'OOL'FOR REAMING AND FITTING VALVE SEATS Filed D60. 23, 1927 ./n ---if I -i I l A n I I l I I l l l lll ---|15 1 .1, `l

G. E. MOEN Sept. 30, 1930.

TO-VOL FOR REAMING AND FITTING VALVE 'SEATS Filed Dec. 2s, '1927 2 sheets-sheet 2 Patented Sept. 30, 1930 mooIlroRnniii/irivc AND rITfrIiviefvAnvE snnfr'sf,

This invention relatesitoitools yfor reaming and `itting 4valve seats of internal 'combustion engines".

VKAn i important #object 4of the invention is to provide a novel andl` improved pilot construe'- tion, whereby the pilot may be madeto fit accurately in-va-lvefstern guides which areworn oriofdiiferent diameters. c i` n' 'further object of the=finvention is to Yprovide Va"novel"alnd improved tool `holder construction whereby thelltools maybe held in a desired` adjusted position, and whereby compensation may be'had; for` wear. upon' the ilot. y, IvJ-iAfstill `i'urther objectof the invention is the improvement of a:novel"'and1improved means for mounting the toolszupon the tool holderand oiainovelandrimproved tool construction' Vfor use inf? .'connectionA with: .valve seat repairs. g '1 These'l andother objects I attain by the'construction shown in theL accompanying Adrawings, whereinv for the .purpose of illustration is shown a :preferrediembodiment of tmy 'inventionfand whereirrzf f Figure 1 is an enlargedvertical sectional view of a valve seat reaming and ttingvtool constructed in 'accordance with my invention` '1" Figure` 2 is al sideV elevation' fthe spindle `Figure `3 is a view showing a slightlyvmodi# fied .formof thespindle; Y f Y Figure lisa'-detail'sectional View showing awmodifcationfotthe type of 4spindleV shown inY Figure y1% i Figure `5 is a'section onthe line 5-5 of Figurel'v`v f' Figure-` 6 is'a section on the line 6 6 of FigureQ, 1' f u Figure 7 isafdetail sectionaly view illus, trating'the useof a' 'split forfhlding. the valve stem'guideengaging bushing in retracted pos`ition;"` i Figure 8 is a planview of the nut "employed ion 1clamping?theitool elements of the tool,

Referring `now more particularly to the drawings, the numeral 10 generally (designatesa pilotwhichconsists vof ashaft provided at its `approximate middle with, a Vshoulderl'l,whichlsfrmedby reducingone en'd 50 of'thevshaft. `lThe reduced end: ofthe shaft is tapered toward its extremity, as indicated at l2,v and has this;xtremity,'indicated at 13` exteriorly screw-threaded "for 'ithe reception of avnut 14;' Mountedupon'fthereduced ta` 55 pered portion ofth'efsha'ftlis asleeve 15,'the wall of whichrtaper's from its youter toward its inner end with .artaper similar tofthe taper of the shaft; Y The" inner orthinnerend of the sleeve isprovided with an enlargement 60 16, while the outerfor thie'kerend' thereof is formed -with an :annular 'g`rove"17. "The sleeveis Vconstructed inany suitable=manner,

sol that' a substantially uniformfcircumferential expansion thereo` may be obtainedwhen 65 the. sleeve is shiftedlongitudinally upon` the tapered end of the fsha'ft." In the present instance, the sleeve is shown as providedzwithV diametricallyopposedpairs offslots 18 and 19, the slotsx18 openingthroughethe thicker m end ofthesleeve andextending nearlyto the thinner `end thereof, `while the. slots 19 open through' `the thinner end of i the sleeve` f and extend" f nearly. to l the, thickerA endif thereof; Betweenlthe shoulder ll'and the 'head1 16 of 75 the'sleeve, a'springQO surrounds the shaft and constantly urges the thickerend.1 of the sleeve into engagement" with theinut.k

`Surrounding the upperendl of the` shaft is av tool holder, generallydesignated at 21. 30 This tool holder is inthe 'ifor'm 'of a body having` a central bore'22 'and havingits lower end reduced, as indicated at 23,"for the reception ofi-a tool. -Any suitablenieans for `connect`V ing thetool to -tlis'j reduced end maybe'pro- 85 videdi Y The upperl end bf the body is` formed asa'nutQet that is,iismany sided and the upperend` of theboresof the! body is preferably",sc1evvt hreaded, as indicated at 25` The bore et: the bodyv and; the exterior no of the pilot shaft are so formed that a tapering annular space is provided therebetween. In Figure l, the bore of the body is shown as tapered while the shaft is straight. In Figure 3, the bore of the body is straight and the shaft is tapered. A tapered split sleeve 26 is provided to fit in this space and means are provided whereby this tapered split sleeve may be adjusted longitudinally of the space. In the construction shown in Figures 1 and 2, adjustment is attained by threading the exterior of the sleeve at 27 at its larger end for coaction with the threads of the bore of the tool holder 21, while in Figure 3, the shaft is shown as having threaded portions 28 and 29 upon which are mounted nuts 30 for adjusting the sleeve longitudinally.

The construction shown in Figures 1 and 2'is preferred, since it permits a modification of the structure as illustrated in Figure 4. In this ligure, the end of the shaft is shown as extended through the upper end of the sleeve 26 and exteriorly screw-threaded at 31 for the reception of a'nut 33, by means of. which the sleeve and the tool holder mounted thereon may be shifted longitudinally of the shaft as a unit.

The tool employed preferably comprises a sleeve 34 interiorly constructed to fit the reduced portion 23 of the tool holder and to be secured thereto. The exterior of this sleeve has its ends screw-threaded for the reception of nuts 35 and 36. The outer face of the tool holder between the threaded portions is vertically slotted, as indicated at 37, to receive the reamers employed. Each reamer consists of a metallic body 38 having its outer face 39 constructed'as acutting face. The upper and lower end edges are adapted to abut the nuts 35 and 36 and at least one of these edges is provided with a socket 40 for the reception of a retaining element41 carried by the nut. In the present instance, the tool elements have been disclosed as provided with transverse grooves in these end faces and the nut as provided with an annular rib for engagement in these faces. Both nuts may be constructed in this manner, if desired. The grooves 37 are preferably provided'in asufticientnumber tosupport reamers of all of the angles which it is desired to impart to the valve face. An ordinary valve face has an intermediate angle, which forms the actual seat for the valve and at the end'edges greater and less than the intermediate angle forming fillets eliminating sharp edges. If, for example, the angle of the valve employed is O to the vertical or the axis of the' valve stem guide, three reamerblades will preferably be employed,

f one having an angle of 45o andthe others having angles'of 75 Eand-15o respectively. In addition to the grooves for the reception of such reamers, a further groove is provided receivingla metallic body similar to the reamer body and providing a support 42 for an adjustable stop screw 43 which, by its contact with the surface in which the seat is formed, will limit the cutting action. In the present instance, the nut 35 is disclosed as having directed through the flange thereof securing elements 35a engaging in slots 401 formed in the upper ends of the tool elements.

In the use of a device of this character, the pilot is inserted in the guide until the head 16 engages the upper end of the valve stem guide of the engine. The pilot is then forced downwardly as by tapping the same with a hammer until it is rigidly clamped by the bushing. The tool holder is then mounted upon the upper end of the pilot and adjustment of the split sleeve 26 made until the tool holder fits thereon without anylooseness. The tool is mounted upon the tolholder and secured thereto, andthe tool `holder bodily rotated. In event a construction such as shown in Figure 4 is employed, if the cutting operation is slow, due to dull tools or stubborn material, the tool holder may be positively fed longitudinally of the'pilot by adjustment of the nut 33. When the reaming operation, with the use of a tool such as described may be completed in one operation, which is completed, the tool holder is removed and the nut 14 loosened. The shaft 10 is then rotated to free the pilot from the bushing and may be bodily removed. In event difficulty is met with in inserting'the sleeve 15 in the bore of the valve stem guide,this'sleeve may be compressed and held in its compressed position by means of a split ring 44. lVhen the operation is completed, the pilot may be released by tapping upwardly upon the lower end thereof while rotating the same by means of a pjn inserted through the upper end' thereo Since the construction hereinbefore set forth is capableof a certain range of change and modification without materially departing from the spirit of the invention, I do not limit myself to such specific structure except as hereinafter claimed.

I claim i l. In a device for reaming and fitting the valve seats of internal combustion engines, a pilotcomprising a shaft formed with a shoulder intermediate its ends andhaving one end thereof reduced and tapered toward its ex tremity, a split bushing the wall of which is oppositely similarly tapered mounting thereon, a spring extending between the shouldder and the inner end of the split bushing, means at the inner end of the bushing to engage -the upper end of a valve stem guide through which the bushing is directed to thereby shift the bushing toward the shoulder whereby by forcing the pilot through the bushing said pilot may be clamped in the valve stem guide opening of an internal combustion engine and a tool holder rotatably mounted upon the opposite endl of the shaft.

lll() 2. In a device for reaming and fitting the valve seats of internal combustion engines, a pilot comprising a shaft formed with a shoulder intermediate its ends and having one end thereofreduced and tapered toward its extremity, a split bushing the wall ofwhich is oppositely similarly tapered mounted thereon, a spring extending between the shoulder and the inner end of the split bushing, means at the inner end of the bushing to engage the upper end of a valve stem guide through which the bushing is directed to thereby shift the bushingtoward the shoulder whereby by forcing the pilot through the bushing said pilot may be clampedin'the valve stem guide opening of an internal combustion engine and a tool holder rotatably mounted upon the opposite end of the shaft, said bushing having pairs of diametrically opposed slots, each pair of slots opening through one end of the bushing and extending to a point adjacent the opposite end thereof, alternate pairs opening through opposite ends of the bushing.

3. In a device for reaming and fitting the valve seats of internal combustion engines, a pilot comprising a shaft formed with a shoulder intermediate its ends and having one end thereof reduced and tapered toward its extremity, a split bushing the wall of which is oppositely but similarly tapered mounted thereon, a spring extending between the shoulder and the inner end of the split bushing, means at the inner end of the bushing to engage the upper end of a valve stem guide through which the bushing is directed to thereby shift the bushing toward the shoulder whereby by forcing the pilot through the bushing said pilot may b e clamped in the valve stem guide opening of an internal com-v bustion engine, a tool holder rotatably mounted upon the opposite end of the shaft and means for retaining the bushing upon the shaft comprising a nut mountedupon said extremity.

4. In a device for reaming and tting the valve seats of internal combustion engines, a pilot comprising a shaft formed with a shoulder intermediate its ends and having one end thereof reduced and tapered toward its extremity, a split bushing the wall of which is oppositely similarly Vtapered mounted thereon, a spring extending between the shoulder ,l and the inner end of the split bushing, means at the inner end of the bushing to engage the upper end of a valve stem guide through which the bushing is directed to thereby shift the bushing toward the shoulder whereby by forcing the pilot through the bushing said the bushing having an annular groove and a the bushing1cempresse-d".'I Y A ,i f 5. LI mean's for reaming and fitting valve seat of internall combustion engines, a :pilot of aninternail 1 combustion engine, la tool holder? Asurrciunding'gthe opposite'.` endlofY tlie pilotin spa-'ced relation thereto, Lthelconfront ing faces-f th'epilot and-tool holder Vbeing so formed as y.to provide a downwardly tapered annular space therebetween, andasp'litlbushing disposedinsaid space and fitting therein 'and having-screwithreaded engagement with the tool holder, thereby providing screw-threaded engagement with the pilot plitiringengageable--in saidfgroovel to'hold p ing of an internal combustion engine, a tool i holder vsurrounding the opposite end of the pilot in spaced relation thereto, the confronting faces of the pilot and tool holder being so formed as to providefa downwardly tapered annularl space therebetween a split bushing in said space and litting therein, means engaging the bushing of the pilot for positively adjusting said bushing longitudinally of the space and means for positively forcing said bushing and-tool holder as a unit toward the first named end of the pilot.

7. In means for reaming and fitting the valve seats of internal combustion engines, a pilot having means at one end whereby it may be rigidly secured in the valve stem guide opening of an internal combustion engine, a tool holder surrounding the opposite end of the pilot in spaced relation thereto, the confronting faces of the pilot and tool holder being so formed as to provide a downwardly tapered annular space therebetween,- a split bushing disposed in'said space and fitting therein, and having screw-threaded engagen ment with the tool holder, the last named end of the pilot being vthreaded and extended through the end of the bushing and a nut adjustable upon the threads thereof engaging the bushing.

8. In a tool of the character described, a pilot comprising a shaft formed with a shoulder intermediate its ends, asplit bushing slidably mounted upon the pilot at the lower end thereof, a stop on the lower end of the pilot limiting the downward movementV of the bushing, a spring bearing against the shoulder at one end and at the other end bearing Vagainst the pilot and urging it downward and a tool holder rotatably mounted upon the shaft above the shoulder.

9. In a tool of the character described, a pilot, a cutting tool operatively mounted 'upon the pilot, avtapered bushing slidingly mounted upon the lower end of the pilot below the cutting tool, a stop at thelower end of the pilot limiting the downward 1novement of the bushing, and a spring bearing at one end against the pilot and at the other end bearing against saidrbushing and urging the bushing downward against the stop, the bushing being independently movable vertically upon the pilot with relation to the outtng tool.

In testimony whereof I hereunto affix my signature. v

GEORGE E. MOEN.

#so Y 

